Update export to file CLI docs

Author: Christine WANJAU

articles/azure-app-configuration/howto-import-export-data.md

@@ -336,6 +336,10 @@ From the Azure CLI, follow the steps below. If you don't have the Azure CLI inst
 
     :::image type="content" source="./media/import-export/continue-export-file-prompt.png" alt-text="Screenshot of the CLI. Export to a file confirmation prompt.":::
 
+By default, feature flags exported to a file will be declared using the [.NET Feature Management schema](https://github.com/microsoft/FeatureManagement/blob/main/Schema/FeatureManagement.v2.0.0.schema.json). If there are variant flags, they will be declared using the Microsoft Feature Management schema.
+
+To export feature flags to a file declared using only the [Microsoft Feature Management schema](https://github.com/microsoft/FeatureManagement-Dotnet/blob/main/schemas/FeatureManagement.Dotnet.v1.0.0.schema.json), set the environment variable `AZURE_APPCONFIG_FM_COMPATIBLE` to `False`.
+
 You've exported key-values and feature flags that have the "prod" label to a configuration file, and have trimmed the prefix "TestApp". Values are separated by ";" in the file.
 
 For more optional parameters and examples, go to [az appconfig kv export](/cli/azure/appconfig/kv?view=azure-cli-latest#az-appconfig-kv-export&preserve-view=true).